i have the same problem in the sportivo aswell. its really bad when you pull out onto the street and have no power with a car tearing down the road towards your drivers side door. yeah it revs up clearly in neutral but not once the clutch is let out. i always just put the foot down and it feels like it is clearing out the airways. What? No cars should have to "clean out the airways" before they drive properly. It sounds like your car is struggling under load, which could be a whole host of problems. it seems like it does struggle a bit. but i must add this is when i dont warm her up at all. turn the key and off i go. i try to warm it up for at least 30 secs but it is not always possible. it is only within the first minute of turning it on then it goes away. i really have to put my foot down to get her to move, and if i dont it drops to about 500rpm and nearly stalls So what code is now stored? if the maf is severely dirty it will either throw a lean code or your fuel trim will be out of wack. possible measurements of the maf at idle and 2000 rpm would cancel that. Also first hand i have seen the rear o2 sensor cause drivability issues when cold.. there won't be a fault code and majority of the time when checked the wavelength is correct.